Harmonic party-line telephone-ringer.



0. J. BRIOKSON.

HARMONIG PARTY LINE TELEPHONE RINGER.

- v APPLICATION FILED AUG.11, 1906. 978,864.

Ptented Dec.2'0, 1910.

UNITED STATES PATENT OFFICE.

CHARLES J. ERICKSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO FIRST TRUST AND SAVINGS BANK, TRUSTEE, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented Dec. 20, 1910.

Application filed August 11 1906. Serial No. 330,190.

To all whom it may concern:

Be it known that I, CHARLES J. ERIOKSON, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Harmonic Party-Line Telephone-Ringers, of which the following is a specification.

My invention contemplates an improvement on the method of mounting elect-romagnet armatures disclosed in my prior application Serial No. 291,680, filed December 14:, 1905.

My invention relates to ringers for use on telephone lines having a plurality of substations.

It relates more especially to ringers which are tuned in order that alternating or other similar currents of various frequencies can be employed for selectively ringing or signaling the different substations on theparty line.

Generally stated the object of my invention is the provision of an improved and highly efiicient harmonic ringer.

Special objects of my invention are the provision of improved means for supporting the striker, striker-arm and armature'of a harmonic ringer; the provision of an improved construction and arrangement for supporting and mounting the spring of a harmonic ringer; the provision, more specifically considered, of a spring which is mounted between its ends and whichhas its opposite ends suitably connected with the striker-arm of a harmonic ringer; and the provision of certain details and features of improvement and combinations tending to increase the general efiiciency and serviceability of a harmonic ringer of v this particular character.

To the foregoing and other useful ends, my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a front elevation of a harmonic ringer embodying the principles of my invention. Fig. 2 is a detail section on line 2-2 in Fig. 1. Fig. 3 is a detail section on line 33 in Fig. 1.

My improved ringer is of the polarized type and, as illustrated, comprises a bracketplate A upon the upper surface of which are suitably supported the gongs B, B. y The permanent magnet C has its upper end secured to a. bracket-plate D, which latter is supported upon the bottom of the plate A. The electro-magnets E are also suitably supported from the plate I), and at the opposite sides of the said permanent magnet. The projecting cores or pole-pieces e of the said ele'ctro-magnets are provided with circumferential grooves 6 A yoke F of nonmagnetic material is provided with relatlvely large openings f adapted to slip over the end portions of the cores or pole-pieces c, said yoke being also provided with notches f leading outwardly and laterally from the said openings f. The ends of these notches are rounded and of a size to fit into the grooves 6 With this arrangement the said yoke can be applied to the electro-magnets before the latter are secured to the plate D. A threaded stud f extends downwardly from the middle portion of the said yoke.

The spring mounting G has its middle portion provided with an opening adapted to receive the stud F, the said spring being clamped in place by the threaded nuts f and f. To the free ends of said spring are attached the end portions of a U-shaped mounting H, which latter carries the strikerarm h. The striker or bellclapper I is adjustably secured upon the upper end portion of the said striker-arm h. Screws or other devices k can be employed for securing the mounting H upon the ends of the said spring. It will be seen that the mounting H and the spring G both extend at substantially right-angles to the yoke F. Furthermore, the said spring is arranged beneath the said yoke, while the said mounting is positioned above the yoke. The magnet armature J has itsend portions arranged in operative relation to the cores or pole-pieces e, and is provided with lateral projections j which are secured to the ends of the said spring G, the screws k serving also for this purpose. With this arrangement it will be seen that the middle portion of the said 3.

spring G is rigidly secured to the middle portion of the yoke F, while the free end portions of the said spring are connected with the mounting H, which latter serves as a rigid connection between the armature J and the striker-arm h. The lower end of the permanent magnet C is arranged in suitable relation to the said armature, as shown, and its upper end or pole is magnetically connected with the cores or pole-pieces of the said elec-tro-niagnets. This, however, will be well understood and need not be further explained.

The springs G, of the different ringers on a party line, can be of a different weight or thickness or tension, so that the ringers will all be responsive to different frequencies of current, each being tuned to respond to some certain frequency. The spring G is, of course, in the nature of a torsional spring, inasmuch as it is subjected to a twisting action by the armature J and the consequentvibration of the striker-arm and striker. The threaded stud 7, together with the clamping nuts 7 and 7, permit the spring G to be moved up and down thereon, thus insuring correct adjustment of the armature relatively to the electro-magnets.

It will be seen that the/armature, in addition to being mounted upon a spring in the manner explained, is mounted for pivotal adjustment in a plane parallel with the said spring, and about an axis located centrally or between the ends of the armature. In fact the entire armature and spring and striker are adapted to be given a rotary ad justment about an axis which is practically coincident with the striker-rodthat is to say, which extends lengthwise of the said rod. In this way the entire armature and spring and striker structure or combination can be adjusted rotatably relative to the magnet, and in such manner as to accurately position the different parts.

hat I claim as my invent-ion is 1. In a bell or ringer, the combination of a support, electro-magnets mounted on said support, gongs carried by said support, a spring, means for mounting the spring at its middle or central portion, a striker or bellclapper, an armature rigidly connected with said striker or bell-clapper, a permanent magnet, and a U-shaped member by which the striker is connected with and mounted upon the end portions of said spring, for the purpose set forth.

2. In a bell or ringer, a spring, means for supporting said spring between its ends, a striker, means for mounting the striker upon the free end portions of said spring, an armature rigidly connected with said striker, said striker and armature adapted to vibrate in a direction to give the spring a torsional twist, electro-magnetic means for operating said armature, and sound producing means to be engaged by said striker.

3. In a bell or ringer, a pair of electroinagnets provided with cores or pole-pieces each having a circumferential groove, a yoke provided with openings adapted to slide over the ends of said cores or polepieces and having lateral and outwardly-extending notches leading from said openings, said notches adapted to engage the said grooves on the said cores or pole-pieces, a

striker, an armature connected with said striker, and sound producing means to be engaged by said striker.

ff. The combination of a torsional spring, an armature having portions thereof secured to and supported by the ends of said spring, means for supporting said spring at apoint between its ends, and an electromagnet for vibrating said armature against the torsion of said supporting spring.

In a telephone ringer, the combination of an electromagnet frame, an armature therefor, a supporting member held stationary with reference to the electromagnet frame, a reed or spring-plate secured at an intermediate point to said supporting member, the ends of said reed or spring-plate being secured to the armature, a clapper connected with the armature, and bells disposed to be struck by the clapper upon vibration of the armature.

6. In a telephone ringer, the combination of an electromagnet frame, an armature, a spring-plate or reed secured at its ends to the armature, a supporting member to which the spring-plate or reed is secured at an intermediate point, said supporting member rigidly engaging the electromagnet frame, a clapper connected with the armature, and gongs positioned to be struck by the clapper upon vibration of the armature.

7. In a harmonic ringer, the combination of an electromagnet frame, a planar armature, a flat spring or reed secured at both ends to the armature, means for securing said spring-plate or reed at an intermediate point to the electromagnet frame, a clapper connected with the armature, and bells positioned to be struck by the clapper upon vi bration of the armature.

8. I11 a harmonic ringer, the combination of an electromagnet frame, an armature, a spring-plate or reed secured at its ends to the armature intermediate the armature ends, a rigid supporting member, said spring-plate or reed being secured at an intermediate point to said supporting member, a clapper connected with the armature, and bells positioned to be struck by the clapper upon vibration of the armature.

9. In a harmonic ringer, an electromagnet frame, an armature having an opening through its intermediate part between the pole ends thereof, a spring-plate or reed secured to the armature and extending across said opening, clamping means engaging the spring-plate or reed at an intermediate point, means connecting said clamping means in rigid position with reference to the electromagnet frame whereby energization of the elcctromagnet frame by alternating current will cause vibration of the armature, a clapper connected with the armature, and bells positioned to be struck by the clapper upon vibration of the armature.

10. In a harmonic ringer, the combination or an electromagnet frame comprising a yoke plate and parallel cores extending therefrom, energizing windings on said cores, an armature, a spring-plate or reed secured at its ends to the armature, a supporting member for engaging the pole ends of the cores, means connecting said supporting member with said spring-plate or reed at an intermediate point, means for locking said supporting member to the pole ends of the core to hold the armature ends adjacent thepole ends of the core whereby alternating current flow through the energizing windings will cause vibration of the armature, a clapper connected with the armature, and bells positioned to be struck by the clapper upon vibration of the armature.

11. In a telephone ringer, the combination of an electromagnet frame, an armature having an intermediate opening, a clamping plate, a spring-plate or reed clamped between the clamping plate and armature to lie across the opening in the armature, means for rigidly supporting the central portion of the spring-plate or reed with reference to the electromagnet frame, a striking member connected with the armature, and bells situated to be struck by the striking member upon vibration of the armature.

Signed by me at Chicago, Cook county, Illinois, this 9th day of August, 1906.

CHARLES J. ERICKSON.

Witnesses:

EDWARD D. FALEs,

JOHN ERIOKSON. 

